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There can't be many people in the world that haven't set a passcode on their iOS device to help them protect their data.

But even with the best will in the world, this ultra cautious commuter was caught out thanks to some over the shoulder detective work.

At first it seems that this man has the longest code in history, making speedy impressions on the keypad using his thumb to enter dozens of digits in a bid to access his device .

But even with what appears to be a ridiculously long code to remember, this iPhone user has now started an internet code cracking competition as YouTubers try to work out the puzzle of how to access his device.

(Photo: YouTube)

More than 195,000 people have now watched the video and a number of those viewers have attempted to publish the code.

One such user called DeathCrow says he's solved the puzzle insisting it contains 59 digits and they are: "197712311199925255 2622115104104 1881041911073923021501231287365."

While another user called Muhammad Haniff seems to think it's: "437385629847198472198247219847129856189317519284729

814712984712984721847129."

Perhaps in future he should get a Touch ID , which would allow him to use his fingerprint instead of a passcode, and prevent nosy parkers from capturing his data from over his shoulder.